393949393 has 4 divisors (see below), whose sum is σ = 399498048. Its totient is φ = 388400740.

The previous prime is 393949373. The next prime is 393949399.

It is a happy number.

393949393 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 393949393 - 2¹³ = 393941201 is a prime.

It is a super-2 number, since 2×393949393² = 310392248490136898, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 393949393.

It is not an unprimeable number, because it can be changed into a prime (393949399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2774221 + ... + 2774362.

It is an arithmetic number, because the mean of its divisors is an integer number (99874512).

Almost surely, 2^393949393 is an apocalyptic number.

It is an amenable number.

393949393 is a deficient number, since it is larger than the sum of its proper divisors (5548655).

393949393 is an equidigital number, since it uses as much as digits as its factorization.

393949393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5548654.

The product of its digits is 2125764, while the sum is 52.

The square root of 393949393 is about 19848.1584284286. The cubic root of 393949393 is about 733.0723040446.

The spelling of 393949393 in words is "three hundred ninety-three million, nine hundred forty-nine thousand, three hundred ninety-three".